Patent GB-495084-A (GB)
Title: Improvements in or relating to punching machines for perforating statistical record cards
Filed: 1937-05-07
Abstract: 495,084. Selective punching-machines. BRITISH TABULATING MACHINE CO., Ltd. May 7, 1937, No. 13150. Convention date, May 9, 1936. [Class 31 (ii)] In a punching-machine of the kind described in Specification 362,529 in which a card is moved on a carriage step-by-step past punches, each punch-selecting electromagnet 60 has a plurality of energizing circuits each corresponding to a different card column. A connection is completed in each of these circuits successively by a commutator device 265 operable in step with the card and multiple switch-keys 247, 276 close a connection in each of a plurality of circuits allocated to different card columns tc determine which punch is to be operated in each of a plurality of columns. On the card shown in Fig. 10, columns 2 to 27 are punched from a master card and columns 28 to 35 are punched manually by keys as described in Specification 362,529. Column 36 to 43 are punched under the control of any one date key 276, columns 44 to 47 manually and columns 48 to 56 under the control of any one rate key 247. Column 57 energizes rate key release magnet 261. Columns 57 to 60 are punched manually, and columns 61 to 70 under control of any one rate key. Column 71 energizes rate key release magnets 261 and columns 72 to 80 are punched manually. The rate keys 247, Fig. 1, are arranged in two tiers and are pivoted on rods 248; when depressed against springs 249, they are held down by spring-pressed pivoted latches 253, 255 coupled together by a link 259. A depressed key is released on depression of a further key or upon energization of the release magnet 261 which coacts with an armature 262. An extension of the armature operates to release a depressed date key 276. Each rate key is provided with a number of contacts 266 which co-operate with contact bars 267 extending at right-angles to the keys. The twelve right-hand bars 267, are connected by wires 270, Figs. 8 and 9, to the punch-selecting magnets 60 and the other bars except the extreme left-hand one are connected either directly or through switches 272, 272a to various contacts 273 of the commutator 265 corresponding to the columns controlled by the rate keys. The contacts 273 are successively connected to a common bar 274 by brushes 275 moving with the card carriage. The left-hand contacts 266 on a key 247 which correspond to the various card columns are each connected to the right-hand contact corresponding to the particularpunch which is to be operated in the particular column, (see Fig. 5). Thus depression of a key 247 in conjunction with the commutator 265 effects the punching in, for example, columns 48 to 56 of perforations in any predetermined positions to indicate an amount of gas consumed and the cost thereof. The extreme left-hand contact bar 267 is connected to a magnet 324 which when energized closes contacts 331, 332. In the case of rate keys up to and including '' 40 ", the extreme left-hand contact 266a is connected to the " 70 " contact 266 and the " 1 " and " 2 " holes are thus punched in column 70 ; in the case of rate keys above " 40," this contact is unconnected but the " 70 " contact is connected to the contact for punch " 1 " and a " 70a " contact is connected to the contact for punch " 2 " whereby, according as a key 320 is depressed or not, a " 2 " or a " 1 " hole is punched in column 70 and different costs are recorded in columns 65 to 69. Five date keys 276 are provided for use according as the present reading is on the same or the first or second preceding or succeeding days of the month as compared with the previous month's reading. Each date key has four contacts connected in pairs such as 277, 278 on key Pr1, Fig. 9, to co-operate with contacts 279, 280 which are connected by wires 281, 283, to the " 28 " contact 273, and to a magnet 315 which breaks the circuit of a magnet 83 to disconnect the master card sensing brushes 68 at this column, and by wires 288, 242 to a magnet 289 which closes contacts 291 and to the line 133, respectively. Adjacent the contacts 291 are plug sockets 293 adapted to be coupled to plug sockets 294 connected to the punchselecting magnets 60 so that the key may be set to give any desired hole arrangement. The manual operation is effected by keys which close a contact 238 and one of the contacts 239. The master card operation is effected by sensing brushes 68 spring-urged away from a roll 69.